Behringer V-Tone GMX1200H spare parts needed.

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Hi, I Have a Behringer V-Tone GMX1200H head unit which has the Preset FX Processor knob broken off.


The knob and stem part is missing. All that remains is the base of the stem. I'm interested in getting a replacement knob and the mechanism it it attached to. Think its called a potentiometer.


Wondering if anybody can steer me in the right direction.


Thanks in advance,


Dennis